Mays, Larry W., author
John Wiley and Sons, 2011
Buku Teks
Meckler Publishing, 1983
Buku Referensi
Kuiper, Edward
Butterworth, 1967
Buku Teks
The World Bank, 1993
Buku Teks
Aswathanarayana, U., author
A.A. Balkema, , 2001
Buku Teks
edited by Lewis M. Alexander
University of Rhode Island, 1971
Buku Teks